Question

NEED HELPS!... *_+

A solution of a substance ‘X’ is used for white washing.

(i) Name the substance ‘X’ and write its formula.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
Answer:
(i) The substance whose solution in water is used for white washing is calcium oxide (or quick lime). Its formula is CaO.​

Answer 1

i) calcium oxide

ii)It's reaction with water is-

CaO+ H₂O⟶Ca(OH) ₂ +heat

Step-by-step explanation:

i) calcium oxide

formula: CaO

ii)CaO+ H₂O⟶Ca(OH) ₂ +heat

Answer 2

(i) The substance 'X' used for whitewashing is calcium oxide, commonly known as quicklime, with the chemical formula CaO.

(ii) The reaction of calcium oxide (CaO) with water (H2O) results in the formation of calcium hydroxide (Ca(OH)2) and the release of a large amount of heat:

• CaO + H2O → Ca(OH)2 (Calcium hydroxide) + heat ↑

↪ This reaction is highly exothermic, producing a significant amount of heat, which is why it's important to handle quicklime with care when mixing it with water for various applications like whitewashing.